Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d8267f831076bd…

MALICIOUS

PDF

39.3 KB Created: 2020-08-30 01:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 857d7866a7d8b9150a5dc058d75d9342 SHA-1: 604f77f7f0d22c8aef012c3817684963e0c846f6 SHA-256: 13d8267f831076bd5c45fe4eb6f294895cdc3add11e45148dde13f7f70d5b401
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a malicious site or download. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to Shopify-hosted PDFs, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wix?keyword=jorge+portilla+teoria
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4535/5674/files/20202533713.pdf
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/61659370533.pdf
    • https://cdn.shopify.com/s/files/1/0430/3683/5993/files/bangladesh_map_with_district.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4830/files/jarunogozeto.pdf
    • https://cdn.shopify.com/s/files/1/0431/4490/4855/files/endocrine_society_guidelines_diabetes.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/forenuwumuduwise.pdf
    • https://cdn.shopify.com/s/files/1/0430/9005/1221/files/buxuwudoxidoji.pdf
    • https://cdn.shopify.com/s/files/1/0429/6320/6307/files/62820762529.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8123/files/sexowelerakevizurifavebuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/5077/0333/files/fivomikurevevibe.pdf
    • https://cdn.shopify.com/s/files/1/0436/9917/5579/files/35873919438.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ee4.bin
a0bc0804d8380dde4f4b8c3135d3347b7351dddcd6340700852d92807332a61f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE4 4796 bytes
font_01_sfnt_off00006f47.bin
6da6365450b59691ce821c804fcdbe6bd82ac1c0190c5692eb1746811fc7296b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F47 9812 bytes